Thursday, February 3, 2011

split 30 threads into 3 JVM processes?

Q: if I want to support up to 30 concurrent tasks, which is better

X: 3 processes, 10 threads each
Y: 1 process holding 30 threads

It depends primarily on data-sharing. If there's a pattern of clustering among the threads, where most traffic is within 10 threads, then it's possible to run those 10 in one JVM.

If threads share data randomly and heavily, then X may require IPC overhead. You can minimize it with a database or file-based task allocation. IPC adds dev effort, maintenance effort, complexity.

In practice, X is more fault-tolerant. You can configure the processes differently.

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